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Type: Posts; User: petersonra

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  1. Replies
    3$$
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    112

    crunch the numbers but my guess is the 480V...

    crunch the numbers but my guess is the 480V solution works out better.
  2. Replies
    6$$
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    112

    If it is a single phase device it does not matter...

    If it is a single phase device it does not matter much if it is powered L-L or L-N as long as the voltage and frequency is correct.

    However, it is highly unusual in the US to see a 220V L-N...
  3. Replies
    8$$
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    260

    One of the things I have observed about these...

    One of the things I have observed about these kind of situations is that often what the electrician wants to do has little or nothing to do with safety. It is just they way they want to do it.

    I...
  4. Replies
    3$$
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    136

    There are two separate hazards involved. one is...

    There are two separate hazards involved. one is shock and the other is arc flash.

    You have to protect employees from both hazards.

    De-energization protects from both hazards.

    Shock can be...
  5. Replies
    7$$
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    324

    my question would be why do they think 25 Ohms is...

    my question would be why do they think 25 Ohms is desirable?

    who talked them into that idea?

    I am not opposed to trying to get there but if you are starting at 700 Ohms it may be a lot harder...
  6. VFDs generally have a PF on the line of close to...

    VFDs generally have a PF on the line of close to unity.

    the load PF is typically much lower, as motor PFs tend to be.

    this leads to a lower line current than load current, and thus lower line...
  7. Replies
    15$$
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    393

    That is two days in a row!

    That is two days in a row!
  8. Replies
    15$$
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    393

    I think there are good arguments that can be made...

    I think there are good arguments that can be made that nothing "requires" work while energized.

    It's another example of wording in the code that has never been well defined and probably never...
  9. Replies
    8$$
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    296

    maybe you are dead and just do not know it. :)...

    maybe you are dead and just do not know it.

    :)

    just luck. a lot of kids do things they survive by luck.
  10. Thread: Panel signs

    by petersonra
    Replies
    4$$
    Views
    175

    what makes him think that a sign will have any...

    what makes him think that a sign will have any impact on his potential liability?

    you cannot reduce your liability by telling people not to engage in hazardous activities. how will a sign prevent...
  11. Replies
    1$$
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    128

    Personally, I would be looking at using circuit...

    Personally, I would be looking at using circuit breakers.

    However, I have no issue with the engineer of record making a written declaration that in his experience these motors in these kind of...
  12. Replies
    18$$
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    383

    no currently available PV technology is cost...

    no currently available PV technology is cost effective unless someone else is footing part of the bill.

    like anything else, the quality of the install varies by contractor. if the roof leaks, you...
  13. Replies
    14$$
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    423

    If the system only has two hots, the midpoint of...

    If the system only has two hots, the midpoint of that system is also electrically neutral.

    Not all residential systems here are 240/120 though. Some are actually 2 legs and the neutral of a...
  14. Replies
    9$$
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    376

    at 70 YO, it is probably time to consider...

    at 70 YO, it is probably time to consider replacement.
  15. The line voltage is rectified and then back to ac...

    The line voltage is rectified and then back to ac for the motor, so the phase rotation at the line side just does not matter.
  16. Replies
    2$$
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    168

    In my opinion it is an ICP and thus subject to...

    In my opinion it is an ICP and thus subject to the requirements for them.
  17. Thread: power

    by petersonra
    Replies
    12$$
    Views
    314

    how do you know that if you touch a neutral wire...

    how do you know that if you touch a neutral wire you won't get shocked? have you tried it?

    :)

    The answer is that in most cases, the neutral wire is bonded at its source to earth and to all the...
  18. Replies
    15$$
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    622

    I have never liked the misnomer of value...

    I have never liked the misnomer of value engineering.

    Either bid to the specs or bid to something else but I hate it when someone comes back after the fact and wants to cheapen things.
  19. Replies
    3$$
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    223

    the simplest and most cost effective solution is...

    the simplest and most cost effective solution is to just have them built by a UL shop.

    they will also need to be properly designed to UL standards.

    there is nothing real special about...
  20. Replies
    15$$
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    622

    it meets code. does anything else really matter?

    it meets code. does anything else really matter?
  21. Replies
    22$$
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    929

    what difference does it make?

    what difference does it make?
  22. Replies
    3$$
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    175

    Did "he" cite a code section?

    Did "he" cite a code section?
  23. Replies
    14$$
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    403

    My opinion is that the required bonding in this...

    My opinion is that the required bonding in this case would be via an EGC and not a GEC. I do not believe it will harm anything to tie it together like this if you also have an EGC, but you can't...
  24. Replies
    14$$
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    403

    ground rods or rings are never required. i do...

    ground rods or rings are never required.

    i do not believe what you are suggesting is compliant.

    if the rebar in the footers makes it qualify as a CEE, it has to be part of the grounding...
  25. Replies
    36$$
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    2,232

    where does the code say you cannot use a drywall...

    where does the code say you cannot use a drywall screw to mount something?
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